Insulator-pin.



M. C. ROSENFELD. INSULATOR PIN, APPLICATION FILED OCT. 22. me.

.69 m mammal QM (M Patented Mar 12, 1918.

' MORTIMER/C. RosENrELn, or CLEVELAND, 01-110.

Y INSULATOB-PIN.

To all whom it may concern:

Be it known that I, MORTIMER O. ROSEN- FELD, a citizen of the United States, resid ing at Cleveland, in the county of Cuyahoga and State of Ohio, have invented a certain new and useful Improvement in Insulator Pins, of which the following is a full, clear,

and exact description, reference being had to the accompanying drawings.

This invention relates to what is known in .the trade as insulator pins or supporting devices whereby insulators used with electrical transmission or-signaling lines may be supported out of contact with the ground or other conductors, and the objects of the invention are the provision of a device of this character of the greatest simplicity, reliability, cheapness of manufacture, and ease of installation; the provision of a device of this character comprising the fewest possible numberof parts; one that shall permit the insulator to be turned in any direction necessitated by the direction of the transmission line, and one which shall minimize the accidental electrocution of birds; while further objects and advantages will become apparent as the description proceeds.

Generally speaking my invention may be defined as consisting of the combinations and constructions recited in the claims hereto an: nexed and illustrated, in one embodiment, in the drawings accompanying and forming a part of this application, wherein: Figure 1 is a vertical, longitudinal, cross-sectional view through my improved insulator pin, showing the same in connection with an arm or bracket and illustrating an insulator" attached thereto; Fig. 2 is a transverse, crosssectional view taken upon the line 22 of Fig. 1 and looking downwardly; Fig. 3 is a perspective view of the insulator pin and its base plate; Fig. 4 a perspective view of the washer; and Fig. 5 a perspective view of the nut used therewith.

Describing the parts by reference characters 1 represents the insulator which is ordinarily of glass, porcelain or'other ceramic material, and 2 an internally threaded metal barrel secured therewithin and adapted for the reception of the insulator pin. While this insulator may take any one of a large number of shapes, it will generally be formed with a transverse slot or recess 2 I adapted for the reception of the mainframe- Specification of .Letters Patent.

Patented Mar. 12, 1918.

Application filed October 27, 1916. Serial No. 127,972

mission wire, and also with a peripheral groove 4 adapted for the reception of the binding wire. .While my improved pin is not limited to employment with an insulator of this type, it offers particular advantages in connection with an insulator having a transverse slot or groove as shown at 3 owing to the necessity of mounting this insulator in a particular direction based upon the direction of the line wire.

My improved insulator pin comprises a central elongated bolt 5 having threads 6 at one end for attachment to the barrel 2 and having threads 7-at the other end for the reception of a suitable nut 8 and washer 9 whereby the same may besecured to a suit able bracket 10. Surrounding the bolt 5 and rigidly afiixed thereto is the frusto-conical hollow metal shell 12 having its smaller end of less diameter than the interior of the insulator as shown in Fig. 1, and united to the bolt at a point adjacent to the threads 6. This union is preferably secured by inserting the bolt 5 into the mold and casting the shell 12 therearound. The length of this shell is preferably rather" considerable as shown in Figs. 1 and 3, and its larger end is squared off so as to define a plane substantially perpendicular to the axis of the bolt.

Withthis pin I employ a base plate 13 having a central aperture l t-for the reception of the bolt 5, and surrounding this aperture and concentric therewith a circular seat 15 adapted for the reception of the larger end of the shell. In the present embodiment this seat is defined by an upwardly projecting boss 16, although other means of defining this seat will readily, occur to those skilled in the art. Outside of this seat the base plate is preferably sloped so as to shed rain which may fall thereon and thus minimiz'e rusting of the iron and rotting of the smoothness of the device prevents birds from alighting on it or from alighting on the cross arm and pecking at the wire.

Having thus described my invention, what I claim is 1. An insulator pin for high tension transmission lines, comprising a central bolt having threads at each end, one set of threads being arranged toreceive an insulator and the other for securing said pin, a hollow frusto-conical metal shell cast around said bolt and having its smaller end united therewith at a point adjacent to said first named threads, the external diameter of said shell at its smaller end being less than the internal diameter of the insulator that is to be used therewith, a base plate for said pin and shaped to engage an arm or bracket, said plate having an aperture for said bolt and a circular seat concentric therewith and spaced therefrom and adapted to receive the larger end of said shell, and means adapted to engage the last named threads to secure said pin to said arm or bracket.

2. The combination, with an insulator having a longitudinal internally threaded attaching barrel and a transverse, wire-receiving slot, of a supporting pin therefor comprising a bolt having threads at each end, one set of threads being arranged to screw into said barrel and the other set for securing said'pin, a hollow frusto-conical metal shell cast around said bolt and having its smaller end united therewith at a point adjacent to said first named threads, the smaller end of said shell being of less diameter than the interior of said insulator, and the larger end of said shell defining a plane perpendicular to said bolt, a base plate for said pin and shaped to engage an arm or bracket,

said plate having an aperture for said bolt and a circular seat concentric therewith and spaced therefrom and adapted to re-' ceive the larger end of said shell, and means adapted to engage the last named threads to secure said pin to said arm or bracket.

3. The combination, with an insulator having a longitudinal internally threaded attaching barrel and a transverse, wire-receiving slot, of a supporting pin therefor comprlsing a bolt havin threads at each end, one set of threads eing arranged to screw into said barrel and the other set for interior of said insulator, means supporting the lower end of said shell upon a bracket or cross arm, and means adapted to engage the last named threads to secure said pm to said arm or bracket, said bolt and shoulder being rotatable with reference to said supporting means.

4. In a device of the character described, in combination, an insulator having a longitudinal 'interna-lly threaded bore, an internally and externally threaded attaching barrel adapted to be screwed home into said bore, a supporting pin comprising an elongated bolthaving threads at each end thereof, one set of threads being arranged to screw into said barrel and the other set for securing the device to a bracket, said bolt having a shoulder formed thereupon at a point adjacent to said first named threads and a downwardly extendin hollow frustoconical metal shell having its smaller end integrally united with said shoulder, the smaller end of said shell being of less diameter than the interior of said insulator and the larger end of said shell defining a plane perpendicular to said bolt, a base plate for said device, said plate being adapted to rest upon said bracket and having an aperture for said bolt and a circular seat concentric therewith. and spaced therefrom, the larger end of said shell bein adapted to rest upon said circular seat, said plate having its upper surface immediately surrounding said seat sloping ofi' to the outer edge for the pur-' pose described and means for engaging the last named threads to secure said device to said bracket.

In testimony whereof, I hereunto afiix my signature.

- MORTIMER C. ROSENFELD. 

